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Sequoia 885lar95037 <br /> Megan Hill,CA 95437 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> tratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLK0837 <br /> 30 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA, 95682 Project Manager: Jay Johnson 12/23/02 10:37 <br /> i <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> FAnyte Result Limit Units Level Result %R-EC Limits RPD Limit Notes <br /> Batch 2K30002- EPA 5035 <br /> Matrix Spike Dup(2K30002-MSDI) Source: RZLK0861-03RE1Prepared: 11/30/02 Analyzed: 12/0I/02 A-01 <br /> Methyl tert-butyl ether 61.0 2.4 ug/kg 48.5 ND 126 60-140 2.15 25 <br /> Surrogate; 1,2-Dichloroethane-d4 4.35 5.00 87.0 60-140 <br /> Batch 2LO4034-EPA 5030B P/T <br /> Blank(2L04034-BLK1) Prepared&Analyzed: 12/05/02 <br /> Ethanol ND 40 ug/l <br /> tcrt-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 0.50 <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 " <br /> ichloroethanc ND 0.50 " <br /> ibromoethane(EDB) ND 0.50 " <br /> Surrogate:l,2-Dichloroethane-d4 4.98 5.00 99.6 78-129 <br /> Laboratory Control Sample(2L04034-BSI) Prepared&Analyzed: 12/05/02 <br /> Methyl tert-butyl ether 8.11 0.50 ug/l 10.0 81.1 63-137 <br /> Surrogate:1,2-Dichloroethane-d4 4.77 5.00 95.4 78-129 <br /> Laboratory Control Sample Dup(2L04034-BSD]) Prepared&Analyzed: 12/05/02 <br /> Methyl tert-butyl ether 8.13 0.50 ug/l 10.0 81.3 63-137 0.246 13 <br /> Surrogate,1,2-Dichloroethane-d4 4.82 3.00 96.4 78-129 <br /> ioia Analytical- Morgan Hill The rendts in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 12 of 13 <br />